You are on "EARC" AKA Eastern Arc then. If your signal levels are at the average signal level for your area, and you are checking the transponders listed on the chart, then there's nothing else that can be done. I'm guessing there are no potential obstructions (trees, etc.) that can sway in the wind?
At any rate, as everyone else has said, there will be times where it is raining cats & dogs and you won't lose signal, and there will be times where it might not be raining at all and you will lose signal briefly (typically 5 minutes, at worst around 15 minutes.) It's all to do with the mile-high thunderclouds that attenuate the signal. It's just the nature of the Ku band. Most people prefer the Ku band with the smaller dish than a big ugly dish used for C band which is a lot less susceptible to "rain fade."
For me, I have had cable, satellite, and U-verse. Cable would go out a lot just because it sprinkled (something down the street would blow up) and it took anywhere from hours to days for them to fix. U-verse has gone out for 4 hours at a time before on a perfectly clear sunny day. Out of those three, I prefer a reliable satellite signal that I KNOW will come back in a matter of minutes as opposed to wasting my life on the phone with reps.
So, take it any way you like, it's just how it is.